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CVE

CVE-2023-2422

A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does

A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client, therefore, access data that belongs to other clients.

MEDIUM · CVSS 5.5 EPSS 0.00323
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-295Improper Certificate Validation
CWE-295Improper Certificate Validation
▤

Affected Products & Versions

3
redhat keycloakall versions
redhat openshift container platformall versions
redhat single sign-onall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.keycloak:keycloak-services HIGH fixed in 21.1.2
▣

Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Oct 2023 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
rhsaRHSA-2023:3888Important
rhsaRHSA-2023:3883Important
rhsaRHSA-2023:3885Important
rhsaRHSA-2023:3884Important
rhsaRHSA-2023:3892Important
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://access.redhat.com/security/cve/CVE-2023-2422Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2191668Issue TrackingVendor Advisory
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